[j-nsp] Forwarding Table Entries represented with ">"

Tue Jun 5 08:52:35 EDT 2007

I am trying to figure out the significance of the ">" symbol within the
routing table output on the Juniper routers.

According to juniper docs:
"Next hop information Routes may be assigned more than one next-hop
value. Each next hop instructs the router where to forward packets for
each route. When multiple next hops exist, the routing table selects a
single next hop to be placed in the forwarding table. This selected next
hop is marked with a caret (>) in the output. Multiple next-hop values
can be placed in the forwarding table. "

I have sample output from one of our routers, with BGP multipath
running.
Both routes learned to dest are provided as next hops to the active
route & both are installed in the forwarding table.

Yet only one of the routes is represented with a ">" in the show route
output.

Any thoughts would be appreciated.

user at SITEA> show route 8.6.80.0/23

inet.0: 221846 destinations, 407889 routes (221845 active, 0 holddown, 1
hidden)
+ = Active Route, - = Last Active, * = Both

8.6.80.0/23        *[BGP/170] 3d 00:12:51, MED 0, localpref 100, from
ip.ip.ip.ip
                      AS path: 3356 11186 I
                      to x.x.x.x via ge-0/0/0.208, label-switched-path
gate-1
                    > to y.y.y.y via ge-0/0/0.209, label-switched-path
gate-2
                    [BGP/170] 3d 00:12:44, MED 0, localpref 100, from
ip.ip.ip.ip
                      AS path: 3356 11186 I
       > to y.y.y.y via ge-0/0/0.209, label-switched-path gate-1

user at SITEA> show route forwarding-table destination 8.6.80.0/23 detail
Routing table: inet
Internet:
Destination        Type RtRef Next hop           Type Index NhRef Netif
8.6.80.0/23        user     0                    ulst 262153 167465
                                                 indr 262147 34304
                              x.x.x.x     Push 364400       ge-0/0/0.208
                                                 indr 262145 15499
                              y.y.y.y     Push 336544       ge-0/0/0.209

user at SITEA> show route forwarding-table destination 8.6.80.0/23
extensive Routing table: inet [Index 0]
Internet:

Destination:  8.6.80.0/23
  Route type: user
  Route reference: 0                   Route interface-index: 0
  Flags: sent to PFE
  Next-hop type: unilist               Index: 262153   Reference: 167465
  Next-hop type: indirect              Index: 262147   Reference: 34304
  Nexthop: x.x.x.x
  Next-hop type: Push 364400
  Next-hop interface: ge-0/0/0.208
  Next-hop type: indirect              Index: 262145   Reference: 15499
  Nexthop: y.y.y.y
  Next-hop type: Push 336544
  Next-hop interface: ge-0/0/0.209

Barry O'Connell
IP Engineering Manager

Irish Broadband
Unit 6, Sandyford Business Centre
Sandyford Industrial Estate
Dublin, Dublin 18
Republic of Ireland

Mobile: 
Email: barry.oconnell at irishbroadband.ie

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